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I've had my MBP for about 9 months now and have had absolutely no problems with it 'til now.

The F9 & F10 keys are suppose to adjust the brightness of my screen, but for the last week or so it's not letting me. When I hit one of those two keys, it displays the little circle with the line through it saying I can't do that.

I've played around with the system preferences, but haven't found anything that works. I do have have the computer set to automatically adjust screen brightness as the light in the room changes, but when I disabled that there was no difference in the F9 & F10 keys.